typescript – “TypeError：无法读取属性’然后’未定义

离子v1

home.controller.js

angular.module('myApp.home',['myApp.services.camera',])

.controller('HomeCtrl',function($scope,CameraService) {
  $scope.getPicture = function() {
    var onSuccess = function(result) {
      // Some code
    };

    var onError = function(err) {
      // Some code
    };

    CameraService.getPicture().then(onSuccess,onError);
  };
});

camera.service.js

angular.module('myApp.services.camera',[])

.service('CameraService',function($q,$ionicPlatform,$cordovaCamera) {
  return {
    getPicture : function() {
      var deferred = $q.defer();

      var onSuccess = function(result) {
        deferred.resolve(result);
      };

      var onError = function(err) {
        deferred.reject(err);
      };

      // my options here

      $ionicPlatform.ready(function() {
        $cordovaCamera.getPicture(options).then(onSuccess,onError);
      });

      return deferred.promise;
    }
  };
});

这很好用.

现在用v2.

离子v2

取photos.ts

import {Page,NavController} from 'ionic-angular';
import {CameraService} from '../../services/camera.service';

@Page({
  templateUrl: 'build/pages/take-photos/take-photos.html',providers: [CameraService]
})
export class TakePhotosPage {

  constructor(private cameraService: CameraService) {}

  getPicture () {
    this.cameraService.getPicture().then((result) => {
      console.log(result); // Did not called
      // Some code
    },(err) => {
      // Some code
    });
  }
}

camera.service.ts

import {Injectable} from 'angular2/core';
import {Platform} from 'ionic-angular';

@Injectable()
export class CameraService {
  constructor (private platform: Platform) {}

  getPicture () : any {
    // my options here

    this.platform.ready().then(() => {
      navigator.camera.getPicture((result) => {
        console.log(result); // Called
        return Promise.resolve(result);
      },(err) => {
        return Promise.reject(err);
      },options);
    });
  }
}

使用v1,正确返回promise.
随着v2我得到一个错误：
TypeError：无法读取take-photos.ts中未定义的属性’then’为此行this.cameraService.getPicture().然后

我不明白为什么我跟着angular tutorial about services and promises

如果有人有想法,那将是非常有帮助的.